Brake-beam suspension.



N. H DAVIS. BRAKE BEAM SUSPENSION.

APPLICATION FILED OUT- 30, 1911.

PatentedJune 4, 1912.

WITNESSES A TTORNE Y AVAILABLE COPY NATHAN H. DAVIS, 6F PHILADELPHIA, PENNSYLVANIA.

BRAKE-BEAM SUSPENSIGN.

Specification of Letters Patent.

PatentedJuneet, 1912.

Application filed (.tetotier 30, 1911. Serial No. 657,398.

1' 0 all whom it may concern:

Be it known that l, NA HAN l-I. DAVIS, a citizen of the United States at America, re siding in the city and county ofllhiladelphia, in the State of Pennsylvania, have invented a certain new and useful improveineut in Brake-death Suspension, of which the following is a true and exact. description, reference being hadto the accompanying drawings, which form part thereof.

My present invention relates to tlie'nieans for suspending railway brake beams and particularly to what is known as the third suspension of said beams.

The main objects of the invention are, to provide a simpleaudf etl'ective third suspension for brake beams adapted to accommodate the large relative movement between the brake beaiil proper and the axle of the wheels braked consequent on the large amount of wear the brake shoes and the wheels now permitted in many cases before I the shoes and wheels needbe discarded as worn out, and to prevent an undesirable presentation of the brake shoes to the car "wheels at any stage; and to accomplish this with a minimum of frictional resistance to each brake applicationandrrelease and panticularly thelatter; and to provide a third suspension, having the characteristics set forth above and which portraits of the use of a bi'al e..bean1 adapted for interchangeable use with my improved third suspension, or

the standard swinging link third suspension now in common use.

The various features of novelty which characterize my invention are pointed out with particularity in. the claims annexed to and forming a part of this specification. For abctt'er understandingof the lnven tion, however, and the advantages possessed by it, reference should be had to the accompanying drawings and descriptive matter inwhich I have illustrated and described forms in which. my, invention may be embodied.

Of the drawings, Figure l is a side elevation of a brake beam provided with one form of my improved third suspension. Fi 2 is a section on the line 23 of Fig. 1. Fig. 3 is an elevation of a portion of a brake beam and third suspension in which the "latter (litters slightly from that shown in Figs. land 2. Fig. 4 is an elevation taken atrig'ht angles to Fig. 3, of the apparatus shown in the latter figure.

truck. E, represents a spring track element adapted to be secured to the spring plank E" of the truck.

As shown in Figs. 1 and 2, a portion of the post C extends in front of the tension member A ofthe brake beam; and is shaped to provide a pair of aperturecl ears C. A rolling elementv F is j ournaled to the ears C by a pin or journalfshaft G passing -through the eyes in said ears. The rolling element F normally bears upon the spring' traelt member E, and in conjunction with the latter forms the third suspension for the brake beam. As shown, the roller element F is in'thc form of a wheel having aweb portion i extending between the ears C and connecting the hub oi the wheel to the rim, thelatter being at such width as to overlap both ears C. To perinit. .ot suitici'en-t' turning movement of the wheel Frelative to the beam, the wheel is cut away on the lines F and F. With the construction shown in Figs. 1 and 2, it is possible to make the track engaging rim of asingle track engaging third suspension wheel of a width to provide ample bearing, contact between the wheel and track, and to permit of substantial lateral movement of the beam with out; affecting the operative engagement between the wheel F and the track member E.

I prefer to have the, eye or eyes receiving the pin G so located that the beam may beused interchangeably either with the usual link third suspension heretofore in common use or with the roller suspension of my present invention. This requires in general, that the pin G be located comparatively close to the tension member A of the beam. With the constructionshown in Figs. 1 and 2, the pin G may be located as close to the tension member A of the beam as may be de- SlI'8(l,'WllllG at the same time the diameter of the Wheel may be large enough to permit of sutliclent clearance distance between the I stage when the brake shoes and wheel are about Worn out. It will be observed that the wheel F has suflieient freedom for turning to form a rolling support for the Front end of the brake beam throughout the entire range of movement of the latter. In consequence, the frictional resistance to theniovements of the brake beam earryiiua the brake shoes toward and a 'a' from the ear wheels on each brake application and release is practically negligible. The portion of the track E should be so shaped and disposed,

that-the faces of the brake shoes will always be held substantially concei'itrie with the ear wheels with which they cooperate.

Tn the construction shown in Figs. 3 and 4 Iemploy in lieu of the one roller segment F of Fig; 1, three complete roller disks F Having now described my invention what. I claim as new and desire to secure by Letters Patent, is:

1. The combination with a trussed brake .beam having); a strut, of a roller elemen journalt'al to said strut adjacent the connection of the latter to the tension member of the beam, and a truck supported track element on which said roller element runs.

lhe combination with a brake beam formed with the usual eye to a third suspension. of a roller element having a journal received in said eye, and a truck supportedtrack element on which said roller runs.

3. The combination with a brake beam termed with an eve located and adapted to receive a pin connecting the beam to a swinging: third suspension llllli. of a roller element having a journal received in said eye, and a truck supported spring-draw]; element on which said roller runs.

4. The combination with a brake beam proper having a portion extending' transverselv to the length of the beam, of a roller arranged one between the two ears C and the others at the opposite side of the ears 3 beam proper, and a trnek supported spring and all journaled on the same shaft G. This construction provides a roller element having the proper aggregate track engagin; width and permits ot the use of winplete disks or wheels having the maximum diameter possible with a given dist ancc between the pin G and the tension member of the brake beam.

While in accordance with the provisions of the statutes T have illustratm'l and de 1 journaltwl to said portion and comprising a web laterally displaced from said portion. and a rim overlapping said portion. said roller being cut away to permit of a partial revolution of said roller relative to the track element on which said roller runs.

5. ln :1 third suspension for brake beams. the eombiuation with a brake'beam proper provided with a pair of apertnred ears in front of the tension member of the beam, a roller element eomprisine' u' webrxtending betweeuaud journaled in said ears, and a rim overlapping both ears. said rim and web being cut away to permit of a'partial I scribed the best forms of my invention now bcau'n and a truck supported track element known to me, it will be apparent to those skilled in the art that changes may be made tain features of the invention ma be used i without a corresponding use of others.

revolution of said roller with respect to said on which said roller clement runs.

NA'lllAN'll. DAVIS \Yitnesses: I

Aaxoin Kxrz, 1). S'ruivan'r; 

